TW201728313A - Stretchable structure for absorbent article, and method for producing same - Google Patents

Abstract

To provide an article in which a hot melt adhesive is used to affix elastically stretchable members and to adhere a first sheet layer and a second sheet layer, the article maintaining both flexibility and the fixation of the elastically stretchable members. The aforementioned problem is resolved by providing a first sheet layer (12S) comprising a nonwoven fabric, a second sheet layer (12H) facing one surface of the first sheet layer (12S) and comprising a nonwoven fabric, and, between the two sheet layers, a plurality of slender, elongate elastically stretchable members (19) provided extending in the stretch direction with spaces therebetween. Both ends of the elastically stretchable members (19) are affixed to at least one among the first sheet layer (12S) and the second sheet layer (12H) by a first hot melt adhesive (71). The first sheet layer (12S) and the second sheet layer (12H) are bonded by a second hot melt adhesive (72) in a stretch direction range corresponding to the space between both ends of the elastically stretchable members (19). The holding power of the first hot melt adhesive (71) is greater than the holding power of the second hot melt adhesive (72).

Description

Telescopic structure of absorbent article and method of manufacturing same

The present invention relates to a telescopic structure of an absorbent article and a method of manufacturing the same.

In order to improve the fit of each part, an absorbent article is generally provided with a telescopic structure. For example, in the pant-type disposable diaper and the adhesive-type disposable diaper, a waist-width expansion-contracting structure is provided in the waist portion, or a telescopic structure in the leg-surrounding direction is provided in the leg-surrounding portion. Further, of course, in all absorbent articles including a pant-type disposable diaper, a pasting disposable diaper, and a sanitary tampon, a telescopic structure provided in the front-rear direction is widely practiced, and the front-rear expansion-contraction structure is It is called a three-dimensional wrinkle or a planar wrinkle (for example, refer patent documents 1-5).

A typical stretchable structure of the stretchable structure of such an absorbent article is a member having a first sheet; a second sheet facing the one side of the first sheet; and a plurality of elongated The elastically stretchable members are disposed between the first sheet layer and the second sheet layer at intervals along the expansion and contraction direction. The first sheet layer and the second sheet layer form a planar stretchable region, and function to cover and shield the elastically stretchable member, and the elastic stretchable member that is built between the first sheet layer and the second sheet layer It exerts the effect of generating elastic force for elastic expansion and contraction. The elastically stretchable member is fixed to the first sheet layer and the second sheet layer at least at both end portions in a state of being elongated in the stretching direction. By the fixing, the elastically stretchable member is integrated with the first sheet and the second sheet, and the first sheet and the second sheet are contracted by the contraction force of the elastically stretchable member to form wrinkles or wrinkles; If the contracted state is elongated against the contraction force of the elastically stretchable member, wrinkles or wrinkles are unfolded. Generally, the sheet layer becomes an unfolded state without wrinkles or wrinkles at the elastic elongation limit, and with the shrinkage of the elastically stretchable member, the wrinkles are brought closer together, and the wrinkles are most densely gathered in a state of natural length. Nowadays, as means for fixing the elastically stretchable member to the first sheet layer and the second sheet layer, almost all of the hot melt adhesives are selected.

Further, the first sheet layer and the second sheet layer are intermittently or continuously joined to at least one of the stretching direction and the direction orthogonal to the stretching direction. This is because when the first sheet and the second sheet are hardly joined, since one of the layers is seriously floated or displaced with respect to the other layer, the appearance and the feeling of wearing are adversely affected. The joining form of the first sheet layer and the second sheet layer is roughly classified into a combined form in which at least the elastic portion of the elastically stretchable member is fixed at least with respect to the fixing of the first sheet layer and the second sheet layer. The first sheet layer and the second sheet layer are joined together by a hot-melt adhesive at a passing position of the stretchable member (see Patent Documents 1 to 3); and, in an independent form, the elastic stretchable member is not considered in the independent form. The first sheet layer and the second sheet layer are joined together by welding by ultrasonic welding or the like in addition to the passing position of the elastically stretchable member with respect to the fixing of the first sheet layer and the second sheet layer (refer to Patent Documents 4 and 5). ).

On the other hand, the stretchable structure of the absorbent article has a contraction force of the elastically stretchable member at least in these states due to the elastic elongation limit at the time of manufacture of the article and the elongation to a certain extent when the article is used. The elastically stretchable member and the fixing portions of the first sheet and the second sheet may be acted upon in the shearing direction. At this time, if the holding force in the adhesion of the end portion of the elastically stretchable member is insufficient, there is a fear that the elastically stretchable member is detached due to the continuously applied shearing force at the time of manufacture or use. In particular, if one end portion of the elastically stretchable member is fixed and detached, the portion that is fixed and detached is pulled back to the opposite side (hereinafter, simply referred to as pullback) due to shrinkage, so that the stretchability is lost. Therefore, as the hot-melt adhesive for bonding the elastically stretchable member and the sheet, a hot-melt adhesive having high holding power (hardening of aggregation failure) can be used.

However, when the fixing of the elastically stretchable member with respect to the first sheet layer and the second sheet layer and the joining of the first sheet layer and the second sheet layer are performed by a single hot-melt adhesive as described above, Since the fixing and joining must be performed by using a hot-melt adhesive having a high holding power, the hot-melt adhesive having a high holding force is hard, and it is damaged even at a portion where only the joining of the first sheet and the second sheet is performed. Softness. [Previous Technical Literature] (Patent Literature)

Patent Document 1: Japanese Laid-Open Patent Publication No. 2004-229857. Patent Document 2: Japanese Laid-Open Patent Publication No. 2013-132331. Patent Document 3: Japanese Laid-Open Patent Publication No. 2009-148447. Patent Document 4: Japanese Laid-Open Patent Publication No. 2008-295930. Patent Document 5: Japanese Laid-Open Patent Publication No. 2009-297096.

[Problem to be Solved by the Invention] Therefore, a main problem to be solved by the present invention is to perform fixation of an elastically stretchable member with respect to a first sheet layer and a second sheet layer in consideration of a hot-melt adhesive. The article formed by the fixation of the first sheet layer and the second sheet layer can achieve both the flexibility and the elasticity of the elastically stretchable member. [Technical means to solve the problem]

The present invention for solving the above problems is as follows. The invention according to claim 1 is characterized in that: a stretchable structure of an absorbent article, comprising: a first sheet layer composed of a non-woven fabric; and a second sheet layer opposite to the first sheet layer And a plurality of elongated elastically stretchable members disposed between the first sheet layer and the second sheet layer along the expansion and contraction direction and spaced apart from each other; wherein a pair of adhesive portions spaced apart from each other, wherein the elastically stretchable member is fixed to at least one of the first sheet layer and the second sheet layer by a first hot-melt adhesive; at least bonded to the pair of the first sheet The first sheet layer and the second sheet layer are bonded together by a second hot-melt adhesive in a range corresponding to the direction of expansion and contraction between the portions; the holding force of the first hot-melt adhesive is higher than the second The retention of hot melt adhesives.

(Effects) The present invention has the feature that the first hot-melt adhesive and the second hot-melt adhesive share the function of fixing the elastically stretchable member to at least one of the first sheet layer and the second sheet layer, and The functions of the first sheet and the second sheet are joined, and each uses a heat-fusible adhesive having a different holding force (all of which are not welded). The hot-melt adhesive having a high holding power is excellent in fixing property but hard, and conversely, a hot-melt adhesive having a low holding power is inferior in fixing property but soft. Therefore, as in the present invention, if the holding force of the first hot-melt adhesive is higher than the holding force of the second hot-melt adhesive, the elastically stretchable member can be more firmly fixed at both ends of the stretchable range, and at both ends thereof The first sheet layer and the second sheet layer can be joined more flexibly within the corresponding stretching direction range between the portions. At this time, although the fixed portion formed by the first hot-melt adhesive becomes a hard skin touch, the influence is local. Further, since the elastically stretchable member is firmly fixed at both end portions of the expansion and contraction range, the second hot-melt adhesive in the range of the expansion and contraction direction corresponding thereto does not have to bear the fixing function of the elastically stretchable member, so It suffices to bond the first sheet layer and the second sheet layer, so that even a hot-melt adhesive having a low holding force does not cause a problem, and on the contrary, there is an advantage that the main stretchable region becomes softer.

The invention according to claim 1, wherein the first hot-melt adhesive has a melt viscosity higher than a melt viscosity of the second hot-melt adhesive.

(Effective effect) In general, since the hot-melt adhesive having a high melt viscosity maintains a high holding force, as described in the present item, it is desirable that the first hot-melt adhesive has a higher melt viscosity than the second hot-melt adhesive. .

The invention according to claim 1 or 2, wherein the second hot-melt adhesive has a loop tackiness adhesive power higher than the foregoing The initial initial adhesion of a hot melt adhesive.

(Effective effect) Since the hot-melt adhesive having a high initial adhesion of the ring is suitable for bonding the non-woven fabrics to each other, as described in the present item, it is desirable that the initial adhesive force of the second hot-melt adhesive is higher than that of the first hot-melt adhesive. The initial adhesion of the agent.

The invention according to claim 1 or 2, wherein the peeling strength of the first hot-melt adhesive is 100 cN/25 mm or more in both the longitudinal direction and the transverse direction. The peel strength of the second hot-melt adhesive is 100 cN/25 mm or more in both the longitudinal direction and the transverse direction.

(Action Effect) It is desirable to set the peel strength of the first adhesive and the peel strength of the second adhesive within the ranges described in the present item.

The invention of claim 1 or 2, wherein the first and second sheets are joined by the second hot-melt adhesive. The sheet joint portion is arranged in a stripe pattern in which the longitudinal direction of the elastically stretchable member is intermittent and continuous in a direction intersecting the elastically stretchable member; and each of the sheet joint portions The width in the expansion and contraction direction is 0.5 to 4 mm, and the interval between adjacent sheet joints is 4 to 8 mm.

(Operation and Effect) In such a pattern, when the sheet joint portion (continuous joining form in the cross direction) formed by the second hot-melt adhesive is disposed, the elastic stretch member is accompanied by the natural length or the contraction to a certain extent. Shrinking, the first sheet and the second sheet will also shrink, and the portions between the sheet joints in the first sheet and the second sheet will bulge in opposite directions to form wrinkles. State, and its pleats will extend straight and become both full height and the ability to be easily dumped. More specifically, the width of the expansion and contraction direction of each piece of the joint portion affects the interval between adjacent pleats, so when the formed pleats are thin, if the width exceeds 4 mm, the interval between adjacent pleats becomes too wide. In addition, not only the appearance of each pleat will become independent, but when the pleat collapses due to the compressive force in the thickness direction, the deformation of the pleats is weakened, and the effect of supporting the adjacent pleats is weakened, and the result is resistance to deformation. The restoring force after the force or the change becomes weak, and as a result, the soft feeling becomes insufficient. In addition, when the width of the sheet joining portion in the expansion and contraction direction is simply 0.5 to 4 mm, and the interval between the adjacent sheet joining portions is set to be less than 4 mm or more than 8 mm, the following will be obtained. That is, the interval between adjacent sheet joints affects the height and width of the pleats. Therefore, if the interval between adjacent sheet joints is about 2 mm, when continuously joined in the direction of expansion and contraction, the same direction becomes a lack of orthogonal directions. Continuous pleats (meaning that the sheet joints are intermittently disposed in the direction of expansion and contraction). When it is 3 mm, the pleats extend straight in a direction orthogonal to the direction of expansion and contraction, but it is not expected that adjacent pleats support each other. The role, so the softness will be insufficient. Further, when the interval between the sheet joining portions exceeds 8 mm, the wrinkles generated by the compression at the time of packaging may be irregularly collapsed, so that the appearance of the product may be deteriorated. On the other hand, when the width of the sheet joining portion in the expansion and contraction direction is 0.5 to 4 mm, and the interval between the sheet joining portions is 4 to 8 mm, a sufficient soft feeling is obtained, and it is also difficult to be compressed at the time of packaging. Causes wrinkles to collapse irregularly. Further, when having the sheet joint portion of such a pattern, from the viewpoint of flexibility, although the width of the second hot-melt adhesive is desirably narrow, and the holding force of the second hot-melt adhesive is desirably low, at this time, It is difficult to firmly fix the elastically stretchable member to at least one of the first sheet layer and the second sheet layer by only using the second hot-melt adhesive. Therefore, the present invention is particularly suitable for the form described in this section. Furthermore, in the present aspect, the second hot-melt adhesive is continuous, except in the portion where the sheet joint portion and the elastically stretchable member intersect, on the first sheet side and the second sheet side of the elastically stretchable member, In addition to the form in which the second hot-melt adhesive is continuous in the direction intersecting the expansion and contraction direction, the second hot-melt adhesive further includes a form in which the second hot-melt adhesive is continuous on either side via the elastically stretchable member, but in another The adhesive is discontinuous in the direction in which the side intersects the direction of expansion and contraction.

The invention according to claim 5, wherein the first hot-melt adhesive is disposed in a direction orthogonal to the elastically stretchable member, and is intermittent The position where the elastically stretchable members overlap.

(Effective effect) Since the fixed portion of the elastically stretchable member formed by the first hot-melt adhesive is hardened, it is intermittently disposed because it is not damaged as compared with the case where it is continuously disposed in the direction orthogonal to the elastically stretchable member. Softness is preferred.

The invention as claimed in claim 1 or 2, wherein the absorbent article is a pant-type disposable diaper having an outer casing and an inner body, wherein the absorbent article is a pant-type disposable diaper a body that constitutes a front body and a back body, the inner body includes an absorber and the inner body is mounted on the outer body; and both sides of the outer body in the front body and the back body The both sides of the outer casing are joined to each other, and the front-rear direction corresponding to the joined portion is an annular waist portion, and a waist opening portion and a pair of left and right leg openings are formed; the telescopic structure is At least the region on the both sides in the width direction of the inner body is included in the outer casing, and the elastically stretchable member is provided along the width direction.

(Operation and Effect) The outer casing of the pull-on type disposable diaper of the present invention is suitable for at least the region on both sides in the width direction of the inner body.

The invention of claim 8 is characterized in that a plurality of elongated elastically stretchable members are sandwiched between a first sheet composed of a non-woven fabric and opposed to each other. The elastically stretchable members are disposed at intervals along the expansion and contraction direction of the first sheet layer and the second sheet layer composed of the non-woven fabric; and a pair of adhesive portions spaced apart from each other in the stretching direction And fixing the elastic expansion member to at least one of the first sheet layer and the second sheet layer by a first hot-melt adhesive, and at least in a range of expansion and contraction directions corresponding to the pair of bonding portions The first sheet layer and the second sheet layer are joined by a second hot-melt adhesive, and the holding force of the second hot-melt adhesive is lower than the holding force of the first hot-melt adhesive.

(Operation and effect) The same effects as those of the invention described in claim 1 can be exhibited.

The invention according to claim 8, wherein the first hot-melt adhesive has a higher melt viscosity than the second hot-melt adhesive. .

(Operation and Effect) The same effects as those of the invention described in the claim 2 can be exhibited.

<The invention described in claim 10>

The method for producing a stretchable structure of an absorbent article according to claim 8 or 9, wherein the second initial adhesive bond of the second hot-melt adhesive is higher than the initial initial adhesive force of the first hot-melt adhesive.

(Operation and Effect) The same effects as those of the invention described in claim 3 can be exhibited.

The invention of claim 11, wherein the method for producing a stretchable structure of an absorbent article according to claim 8 or 9, wherein the method comprises the following steps: a second hot-melt adhesive coating step, which is a plate roll The circumferential direction is a manner of expanding and contracting, and at least one of the first sheet layer and the second sheet layer is brought into contact with the plate roll, and is held in a stripe pattern that is intermittent in the circumferential direction and continuous in the axial direction. The hot-melt adhesive on the outer peripheral surface of the plate roll is transferred to at least one of the first sheet layer and the second sheet layer; and a crimping step of clamping the elastically stretchable member Between the one layer and the second sheet, the second hot-melt adhesive has been transferred on at least one of the first sheet and the second sheet; and, in the second hot-melt adhesive coating In the cloth step, the width of each second hot-melt adhesive on the outer peripheral surface of the plate roll is set to 0.5 to 4 mm in the circumferential direction, and the circumferential interval of the adjacent second hot-melt adhesive is set to 4 ~8mm.

(Operation and effect) The same effects as those of the invention described in the claim 5 can be exhibited.

The invention of claim 12, wherein the method for producing a stretchable structure of an absorbent article according to claim 11, comprising a first hot-melt adhesive coating step of coating the first hot-melt adhesive And the elastic stretchable member coated with the first hot-melt adhesive, the second elastic fusion bonded to the at least one of the elastic fusion bonded members Between the first layer and the second layer of the agent.

(Operation and Effect) The same effects as those of the invention described in the claim 6 can be exhibited. [Effects of the Invention]

As described above, according to the present invention, it is possible to obtain an advantage of fixing the elastically stretchable member to the first sheet and the second sheet, and the first sheet and the second sheet by means of a hot-melt adhesive. The articles formed by joining will be excellent in both the flexibility and the elasticity of the elastically stretchable members.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Figs. 1 to 6 show an example 100 of a pant type disposable diaper. The pull-on disposable diaper 100 is composed of an exterior body 12 constituting an outer surface (reverse surface) of the product, and an inner body 200 attached to the exterior body 12. Reference numeral 201 denotes a joining region of the inner body 200 and the outer casing 12, a symbol Y denotes the entire length of the diaper, and a symbol X denotes the full width of the diaper.

The inner body 200 is a portion that absorbs and holds excrement such as urine, and the outer body 12 is a portion for wearing the inner body 200 on the body. In addition, the dot pattern portion in the cross-sectional view is a joint portion that joins the respective constituent members, and the joint portion is coated by a full surface such as a hot-melt adhesive, bead coating, or a curtain. It is formed by curtain coating, ceiling coating, or spiral coating.

(Inner Body) The body 200 can have any shape and is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the inner body 200 includes a top sheet 30 that is in contact with the skin side, a liquid-impermeable sheet 11, and an absorbing element 50 interposed therebetween, and is responsible for exerting The body of the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) which is disposed between the top sheet 30 and the absorbing member 50 in order to rapidly transfer the liquid penetrating the top sheet 30 to the absorbing member 50; symbol 60 indicates the wearer facing the wearer The three-dimensional wrinkles 60 which are erected on the skin side are provided on both sides of the inner body 200 in order to prevent leakage of excrement on both sides of the inner body 200.

(Topsheet) The topsheet 30 has liquid-permeable properties, and examples thereof include non-woven fabrics having holes or non-pores, and porous plastic sheets. Further, among them, the raw material fibers of the nonwoven fabric are not particularly limited. For example, olefins such as polyethylene and polypropylene; synthetic fibers such as polyesters and polyamines; regenerated fibers such as bismuth and cuprammonium fibers; natural fibers such as cotton; and The above-mentioned mixed fiber, composite fiber, and the like. Further, the non-woven fabric can be manufactured by any processing. As a processing method, a well-known method is mentioned, for example, a spunlace method, a spunbond method, a thermal bond method, a melt blown method, and needle punching. ), air-through method, and point bond. For example, if softness and ductility are required, the spinning adhesion method and the water needle entanglement method are preferred processing methods; if bulkiness and flexibility are required, the hot air method, the point adhesion method, and the thermal bonding method are comparatively preferred. Good processing method.

Further, the top sheet 30 may be composed of one sheet or a laminate sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may be composed of one sheet in the planar direction or may be composed of two or more sheets.

When the three-dimensional wrinkles 60 are provided, both side portions of the topsheet 30 pass between the liquid-impermeable sheet 11 and the three-dimensional gathers 60, and are wound around the opposite side (back side) of the absorbing member 50, and in order to prevent liquid Infiltration, for the liquid-impermeable sheet 11 and the three-dimensional gathers 60, it is preferable to bond by a heat-fusible adhesive or the like.

(Intermediate Sheet) An intermediate sheet (also referred to as a "second sheet") 40 may be provided between the top sheet 30 and the absorbing element 50. This intermediate sheet 40 can not only improve the absorption property of the absorbent body 56 which is produced by rapidly transferring the liquid to the side of the absorbent body 56, but also prevent the absorbed liquid from being rewet back from the absorbent body 56, and can be used for the topsheet. The surface of 30 presents a dry skin feel. The intermediate sheet 40 can also be omitted.

Examples of the intermediate sheet 40 include the same material as the top sheet 30, a water needle entangled nonwoven fabric, a spunbonded non-woven fabric, an SMS non-woven fabric, a pulp non-woven fabric, a mixed pulp and pulp, a non-woven fabric, or a crepe paper. . In particular, the hot air non-woven fabric is relatively bulky, so it is preferred. The hot air non-woven fabric is preferably a composite fiber using a core-sheath structure. In this case, the resin for the core may be polypropylene (PP), preferably a polyester (PET) having high rigidity. The basis weight is preferably from 20 to 80 g/m ² , more preferably from 25 to 60 g/m ² . The raw material fiber of the nonwoven fabric preferably has a thickness of 2.2 to 10 dtex. In order to make the nonwoven fabric bulky, it is preferable to use a central coreless eccentric fiber, a hollow fiber, and an eccentric hollow fiber as the mixed fiber of all or a part of the raw material fiber.

The intermediate sheet 40 in the illustrated form is disposed at the center so as to be shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate piece 40 in the longitudinal direction may be the same as the length of the absorbent body 56, or may be within a short length centered on the area in which the liquid is contained.

(liquid-impermeable sheet) The material of the liquid-impermeable sheet 11 is not particularly limited, and examples thereof include a plastic film composed of an olefin resin such as polyethylene or polypropylene, and a laminated non-woven fabric. It is formed by providing a plastic film on the surface of the non-woven fabric; or a laminated sheet which is formed by laminating a non-woven fabric or the like on the plastic film. The liquid-impermeable sheet 11 is preferably made of a material having liquid impermeability and moisture permeability, and this material has been favored in recent years from the viewpoint of preventing wetness. As a moisture permeable plastic film, a microporous plastic film is widely used, which is obtained by blending an inorganic filler in an olefin resin such as polyethylene and polypropylene, and forming it into a sheet, and then uniaxially or double Obtained by extending the axial direction. In addition, as the liquid-impermeable sheet 11, a liquid-impermeable sheet which is not made of a plastic film can be used as the liquid-impermeable sheet 11, and the sheet is made of microdenier fiber. The non-woven fabric is formed by a method of enhancing leakage prevention or applying a super absorbent resin, a hydrophobic resin, and a water repellent agent, and the leakage prevention is to apply heat or pressure to make the pores of the fiber. Become smaller.

The liquid-impermeable sheet 11 can be wound around both sides of the absorbing element 50 in order to improve leakproofness, and can be extended to both side portions of the side surface of the top sheet 30 of the absorbing element 50.

Further, on the inner side of the liquid-impermeable sheet 11, particularly on the side surface of the absorber 56, an excretion indicator which is discolored by absorption of a liquid component can be provided.

(Three-dimensional wrinkle) The three-dimensional wrinkle 60 is a belt-like member that extends along both sides of the inner body 200 and throughout the front-rear direction, and is provided to block the transfer on the top sheet 30 and Fluid excrement (urine or soft stool) moving in the lateral direction and preventing side leakage. The three-dimensional gathers 60 of the present embodiment are provided such that the side portions of the inner body 200 stand up, and the root side portion thereof rises obliquely toward the center in the width direction, and the front end side portion faces toward the middle portion. The outer side in the width direction rises more obliquely. Although this form is a surface contact type three-dimensional wrinkle, a line contact type three-dimensional wrinkle (not shown) which does not fold back to the outer side in the width direction may be used.

More specifically, the three-dimensional wrinkles 60 are configured by folding the strip-shaped pleated sheet 62 in the width direction and folding it into two layers, and between the folded-back portion and the sheet near the folded-back portion, the plurality of elongated sheets are elongated. The elastically stretchable member 63 is fixed in the width direction at an interval in an extended state along the longitudinal direction; the crepe sheet 62 has a length equal to the length of the inner body 200 in the front-rear direction. The width direction of the three-dimensional gathers 60, the folded-back portion and the opposite-side end portion are set as the mounting portion 65 which is fixed to the reverse side (back surface) of the side edge portion of the inner body 200; other than the mounting portion 65 The portion is set as the protruding portion 66 (the portion on the side of the folded portion) which is protruded by the mounting portion 65. Further, both end portions in the front-rear direction among the protruding portions 66 are set as a lodging portion which is passed through the side portion of the inner body 200 from the mounting portion 65 and extends to the side surface of the top sheet 30, and is heated by the heat. a fixing means such as a fusion adhesive 67 is fixed to a side surface of the topsheet 30; a middle portion of the protruding portion 66 in the front-rear direction is set as a non-fixed free portion, and at least throughout An elongated elastically stretchable member 63 along the front-rear direction is fixed in an extended state in the entire front-rear direction of the free portion.

As the crepe sheet 62, a pair of spunbonded non-woven fabrics (SS, SSS, etc.) and a spunbond-meltblown-spunbond (SMS) non-woven fabric (SMS, SSMMS, etc.) can be suitably used. A non-woven fabric which is excellent in softness, uniformity, and concealability, such as a melt-blown nonwoven fabric, is subjected to water-repellent treatment by using oxygen or the like as needed, and the basis weight of the fiber is preferably about 10 to 30 g/m ² . As the elongated elastic stretchable member 63, a rubber thread or the like can be used. When an elastic fiber rubber thread is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation at the time of fixation is preferably from 150 to 350%, more preferably from 200 to 300%. In addition, the term "elongation rate" means a value when the natural length is set to 100%. Further, as shown in the figure, the waterproof film 64 can be interposed between the crease sheets folded into two layers.

The number of the elongated elastically stretchable members 63 provided in the free portion of the three-dimensional gathers 60 is preferably 2 to 6, more preferably 3 to 5. The configuration interval 60d is suitable for 3 to 10 mm. According to this configuration, it is easy to face the skin in a range in which the elongated elastic elastic member 63 is disposed. In addition to the tip end side, an elongated elastically stretchable member 63 may be provided on the root side.

The fixing target of the attachment portion 65 of the three-dimensional gather 60 can be an appropriate member such as the top sheet 30 of the inner body 200, the liquid-impermeable sheet 11, and the absorbing element 50.

In the three-dimensional wrinkles 60, the contraction force of the elongated elastically stretchable member 63 can be applied to both end portions in the front-rear direction, but both ends in the front-rear direction of the protruding portion 66 are fixed to fall. The portion of the state, since these are set to be non-fixed free portions, as shown in Fig. 3, only the free portion stands up against the body side. In particular, when the attachment portion 56 is located on the reverse side of the inner body 200, since the three-dimensional gathers 60 are erected outward in the width direction in the vicinity of the crotch portion and the crotch portion, the three-dimensional wrinkles 60 become face-to-face. Relying on the leg circumference, it becomes possible to improve fit.

Further, unlike the illustrated embodiment, the three-dimensional wrinkles on the left and right sides of the inner body 200 may be double-layered (two rows).

(Absorption Element) The absorption element 50 has an absorber 56 and a package sheet 58 that wraps the entire body of the absorber 56. It is also possible to omit the packaging sheet 58.

(Absorber) The absorber 56 can be formed by an aggregate of fibers. In addition to the short fibers such as cotton pulp and synthetic fibers, a long fiber aggregate can be used as the fiber assembly, and a tow (fiber bundle) of synthetic fibers such as cellulose acetate can be used as needed. Opened. When the cotton pulp or the short fibers are deposited, the fiber basis weight can be, for example, about 100 to 300 g/m ² , and when it is a long fiber assembly, it can be, for example, about 30 to 120 g/m ² . The fineness at the time of the synthetic fiber is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. When it is a long fiber aggregate, the long fiber may be a non-crimped fiber, but is preferably a crimped fiber. The curling degree of the crimped fiber can be, for example, about 5 to 75, preferably about 10 to 50, and more preferably about 15 to 50. Further, it is often used in the case of crimped fibers which are uniformly crimped. In the absorber 56, it is preferred to disperse and hold the superabsorbent polymer particles.

The absorber 56 may have a rectangular shape, as shown in FIG. 1 and FIG. 2, and if it is located between the front end portion, the rear end portion, and the like, compared with the front end portion and the rear end portion, the composition has two The hourglass shape of the gather portion having a narrower side width enhances the fit of the absorber 56 itself and the three-dimensional gathers 60 to the leg circumference, and is therefore preferable.

Moreover, the size of the absorber 56 can be appropriately determined, and it is preferable to extend to the peripheral edge portion of the inner body or the vicinity thereof in the front-rear direction and the width direction. Further, reference numeral 56X denotes the width of the absorber 56.

(Superabsorbent Polymer Particles) Some or all of the absorbers 56 may contain superabsorbent polymer particles. In addition to "particles", the superabsorbent polymer particles also contain "powder". The particle size of the superabsorbent polymer particles can be directly used as the superabsorbent polymer particles which can be used in such an absorbent article, and is preferably 1000 μm or less, and particularly preferably 150 to 400 μm. The material of the superabsorbent polymer particles can be used without particular limitation, and is suitably a material having a water absorption amount of 40 g/g or more. Examples of the superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based, and starch-acrylic acid (salt) graft copolymer, starch-acrylonitrile copolymer saponified product, and carboxymethyl cellulose can be used. A crosslinked product of sodium, an acrylic acid (salt) polymer, and the like. The shape of the superabsorbent polymer particles is suitably a granular shape generally used, but other shapes may be used.

As the superabsorbent polymer particles, highly absorbent polymer particles having a water absorption rate of 40 seconds or less can be suitably used. If the water absorption speed exceeds 40 seconds, the liquid supplied into the absorber 56 becomes easily rewound to the outside of the absorber 56.

The amount of the basis weight of the superabsorbent polymer particles can be appropriately determined depending on the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be generalized, it can be set to 50 to 350 g/m ² . If the basis weight of the polymer is less than 50 g/m ² , it is difficult to secure the amount of absorption. If it exceeds 350 g/m ² , the effect is saturated.

If necessary, the scattering density or the amount of scattering of the superabsorbent polymer particles can be adjusted in the plane direction of the absorber 56. For example, the amount of excretion of the body fluid can be made more than other parts. When the difference between men and women is taken into consideration, the distribution density (amount) of the front side of the men's article can be increased, and the density (amount) of the center portion of the article of women can be increased. Further, a portion where no polymer is present may be partially (for example, in a dot shape) in the planar direction of the absorber 56.

(Packaging sheet) When the packaging sheet 58 is used, as the material, a tissue paper, in particular, a crepe paper, a non-woven fabric, a polyethylene laminated non-woven fabric, a sheet having a small hole, or the like can be used. Among them, a sheet in which highly absorbent polymer particles do not leak out is desired. When a non-woven fabric is used instead of crepe paper, a hydrophilic SMS non-woven fabric (SMS, SSMMS, etc.) is particularly suitable, and a material thereof may be polypropylene, a polyethylene/polypropylene composite material or the like. It is desirable to have a basis weight of 5 to 40 g/m ² , and particularly desirably 10 to 30 g/m ² .

The packaging form of the packaging sheet 58 can be appropriately determined. However, from the viewpoints of easiness of production and prevention of leakage of highly absorbent polymer particles from the front and rear end edges, it is preferable to adopt a form in which the absorbent body 56 is positive. The reverse side and the two sides are wrapped in a tubular shape, and the front and rear edge portions are extended from the front and rear of the absorber 56, and then the excess portion is collapsed in the front and back directions, and is joined by means of a hot-melt adhesive or the like. Engage.

(Outer body) The exterior body 12 has a portion constituting the front body F extending from the center in the front-rear direction toward the front side, and a portion constituting the rear body B extending from the center in the front-rear direction toward the back side; both sides of the front body F Engaged with both side portions of the back body B, and as shown in Fig. 6, a waist opening WO and a leg opening LO are formed, the waist opening WO is for passing the wearer's waist, and the leg opening LO is used To allow the wearer's foot to pass through. Reference numeral 12A denotes a joint portion (hereinafter, this portion is also referred to as a side seal portion). Further, the so-called inter-turn portion means the center in the front-rear direction from the waist edge of the front body F to the waist edge of the back body B in the unfolded state, whereas the front side portion and the rear side portion respectively mean the front body. F and back body B.

The outer casing 12 has a waist portion T defined as a front-rear direction range from the waist opening WO to the upper end of the leg opening LO, and an intermediate portion L defined as a front-rear direction range forming a portion of the leg opening LO ( The side seal portion 12A having the front body F is between the front and rear direction regions and the front seal portion 12A having the rear body B. The waist portion T can be schematically divided into a "waist edge portion" W which conceptually forms an edge portion of the waist opening; and a "waist lower portion" U which is located lower than the "waist edge portion" W part. In general, when the waist portion T has a boundary in which the width direction elastic stress can be changed (for example, the thickness and elongation of the elastically stretchable member can be changed), the portion closer to the waist opening WO side than the boundary closest to the waist opening WO side, When the boundary is not present, when the boundary is not present, the portion closer to the waist opening WO side than the absorber 56 or the inner body 200 becomes the waist edge portion W. The length of the longitudinal direction may vary depending on the size of the product, and may be appropriately determined. For example, the waist edge portion W may be 15 to 40 mm, and the waist lower portion U may be 65 to 120 mm. On the other hand, the both side edges of the intermediate portion L are gathered along the leg circumference of the wearer, and here are the portions through which the wearer's legs are inserted. As a result, the exterior body 12 has an hourglass shape as a whole. The degree of folding of the exterior body 12 can be appropriately determined. As shown in FIGS. 1 to 6 , in order to provide a simple appearance, the portion having the narrowest width is preferably narrower than the width of the inner body 200. However, the portion having the narrowest width may be set to be more than the width of the inner body 200.

As shown in FIGS. 3 to 5, the exterior body 12 is formed on the front and back sides by a first sheet layer 12S composed of a nonwoven fabric and a second sheet layer 12H composed of a nonwoven fabric. The raw material fiber of the non-woven fabric is not particularly limited. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters, and polyamides; recycled fibers such as cerium and cuprammonium fibers; natural fibers such as cotton; and The above-mentioned mixed fiber, composite fiber, and the like. Further, the non-woven fabric can be manufactured by any processing. When importance is attached to softness, as at least one of the first sheet layer 12S and the second sheet layer 12H, it is preferred to use: polypropylene (PP) or a copolymer thereof (for example, polyethylene or polyethylene as a copolymer) a non-woven fabric (hereinafter also referred to as a PP-based nonwoven fabric) in which a component is blended; a non-woven fabric of a sheath-core fiber (PE/PP), which has polyethylene (PE) as a sheath, and Polypropylene (PP) is used as a core. As the processing method, a known method such as a water needle entanglement method, a spinning adhesion method, a thermal bonding method, a melt blowing method, a needle rolling method, a hot air method, and a point sticking method may be mentioned. In particular, from the viewpoint of excellent strength and flexibility, a spunbonded nonwoven fabric is preferred, and a spunbonded nonwoven fabric in which a plurality of layers of a spun bond layer are laminated, such as SS non-woven fabric (two layers), SSS (three Layer) Non-woven fabric, or more than four layers of non-woven fabric. Further, although the thickness and the basis weight of the nonwoven fabric are not particularly limited, the thickness is preferably 0.1 to 1 mm, and the basis weight is about 10 to 20 g/m ² . Further, the first sheet layer 12S and the second sheet layer 12H may be composed of one piece of non-woven fabric, or one or both of them may be a plurality of sheets of non-woven fabric.

The first sheet layer 12S and the second sheet layer 12H may be one layer and one or more layers obtained by folding back one piece of the sheet, or may be a layer composed of individual sheets, and may further be the above Both. Further, at least one of the first sheet layer 12S and the second sheet layer 12H may be formed by a sheet different from the other portions. The exterior body 12 of the illustrated embodiment is in the following form, but the form of the exterior body is not limited thereto, and the exterior body 12 has the first sheet and is joined to the outer surface of the first sheet. a second sheet formed on the inner side of the side portion, and at the waist edge portion W, the outer surface side portion and the folded-back portion of the first sheet form the first sheet layer 12S and the second sheet layer 12H, respectively, at the lower portion of the waistline U and The intermediate portion L, the first sheet and the second sheet respectively form a first sheet layer 12S and a second sheet layer 12H; the first sheet material has: an outer surface side portion which is an edge of the waist opening WO from the front body Extending to the edge of the waist opening of the back body; and the folded-back portion 12r (extending the end portion of the waist opening WO side of the inner body 200), which is inwardly formed by the edge of the waist opening WO of the front body The surface side is folded back.

Further, in order to improve the fit of the body, the outer body 12 has the first stretchable region A3 and the intermittent stretchable region A2, and the first stretch of the continuous stretchable region A3 and the intermittent stretchable region A2. Between the layer 12S and the second sheet layer 12H, an elongate elastically stretchable member 19 (15 to 17) such as a rubber thread is provided along the width direction and at a specific elongation, so that it can expand and contract in the width direction (the width direction is the expansion and contraction direction). The continuous stretchable region A3 is continuous to the waist opening WO side in the width direction than the absorbent body 56; the non-stretchable region A1 is disposed in the middle in the width direction in the range of the front direction before the absorber 56; the intermittent stretchable region A2 is disposed at Both sides of the non-elastic region A1 in the width direction. As the elongated elastic stretchable member 19, synthetic rubber may be used, or natural rubber may be used. A part or all of the range of the front and rear directions having the non-expanded area A1 and the intermittently-expanded area A2 in the illustrated form may be an extended stretch area A3 extending over the entire width direction, or a non-elastic area A1 in the illustrated form. The front and rear direction ranges are extended to the waist side or the intercondylar side.

The above-described configuration will be described in more detail. First, the waist edge portion W of the exterior body 12 is set as the continuous stretchable region A3, and between the first sheet layer 12S and the second sheet layer 12H, over the entire width direction. In a continuous manner, a plurality of waist elastic stretch members 17 are mounted in a state in which the space is spaced apart in the front-rear direction and elongated in the width direction at a specific elongation. In the waist elastic stretchable member 17, one or a plurality of waist elastic stretchable members 17 disposed in a portion adjacent to the lower waist portion U can be overlapped with the absorbent body 56. The portion adjacent to the waist lower portion U of the waist edge portion W can be a region having the non-elastic region A1 and the intermittent stretch region A2 similarly to the waist bottom portion U. The waist elastically stretchable member 17 preferably has a thickness of about 3 to 22 pieces of about 155 to 1880 dtex, particularly about 470 to 1240 dtex (this is a case of synthetic rubber. When it is natural rubber, the cross-sectional area is 0.05. The rubber thread of ~1.5 mm ² , especially about 0.1 to 1.0 mm ² , has an elongation of 150 to 400%, especially 220 to 320%, respectively, at intervals of 5 to 20 mm, particularly 8 to 16 mm. To install. Further, it is not necessary for all of the waist elastic stretchable members 17 to have the same thickness and elongation. For example, in the upper and lower portions of the waist edge portion W, the thickness and elongation of the elastically stretchable members may be different.

Further, between the first sheet layer 12S and the second sheet layer 12H in the waistline lower portion U of the outer casing 12, the non-elastic region A1 is excluded, and the upper side and the both sides in the width direction are spread over the entire width. In a directional and continuous manner, a plurality of waist lower elastic stretch members 15 are mounted in a state of being spaced apart in the front-rear direction and elongated in the width direction at a specific elongation, and the waist lower elastic stretch members 15 are elongated The elastic elastic member is composed of. The waist elastic lower elastic member 15 preferably has a thickness of about 5 to 30 155 to 1880 dtex, particularly about 470 to 1240 dtex (this is a case of synthetic rubber. When it is natural rubber, the cross-sectional area is 0.05. The rubber thread of ~1.5 mm ² , especially about 0.1 to 1.0 mm ² is mounted at an elongation of from 5 to 20 mm, especially from 8 to 16 mm, at an elongation of from 200 to 350%, especially from 240 to 300%. .

Further, between the first sheet layer 12S and the second sheet layer 12H in the intermediate portion L of the exterior body 12, the non-expanding region A1 is excluded, and the respective portions on both sides in the width direction thereof extend over the entire width direction. In a continuous manner, a plurality of intermediate elastically expandable members 16 composed of an elongated elastically stretchable member are attached in a state in which the space is elongated in the front-rear direction and elongated in the width direction at a specific elongation. The intermediate portion elastically stretchable member 16 preferably has a thickness of about 2 to 10 and a thickness of about 155 to 1880 dtex, particularly about 470 to 1240 dtex (this is a case of synthetic rubber. When it is natural rubber, the cross-sectional area is Rubber lines of 0.05 to 1.5 mm ² , especially about 0.1 to 1.0 mm ² , with an interval of 5 to 20 mm, especially 8 to 16 mm, each having an elongation of 150 to 300%, especially 180 to 260% Rate to install.

Further, as in the intermittent stretchable region A2 of the illustrated embodiment, the elastic stretchable member 19 (in the illustrated embodiment, the waist elastic portion 16 and the intermediate elastic stretch member 16) are provided in the outer casing 12, and Except that the expansion and contraction regions A1 are provided on both sides in the width direction thereof, the width direction of the absorber 56 in the non-elastic region A1 can be prevented from contracting. Therefore, it is preferable that the non-elastic region A1 is a region in the middle in the width direction (preferably including the entirety of the joint region 201 of the inner body 200 and the outer casing 12), and the width direction includes the width of the absorbent body 56. A part or all of the overlapping portions are set to the intermittent stretchable region A2 in the entire width direction up to the side seal portions 12A on both sides in the width direction.

(Outer body division structure) In the example of the figure, the front body F to the back body B are continuously covered by the integral outer body, but the following may be used: the outer body forming the front body F and The outer casing forming the rear body B is not continuous on the crotch side, but is separated (not shown). At this time, among the outer surfaces of the inner body 200, the outer body and the outer body F are formed. Between the outer casings of the rear body B, the inter-turn outer casing for covering the exposed portions can be bonded. As the crotch portion outer casing, the same material as that which can be used in the above-described outer casing can be used.

(Regarding the telescopic structure) In the pant type disposable diaper, the stretchable structure of the present invention can be employed in a region extending from the waist edge portion W to the intermediate portion L. That is, as shown in FIG. 4, FIG. 7, and FIG. 11, the portion is provided between the first sheet layer 12S and the second sheet layer 12H, and has a plurality of elongated elastic stretching members 19, the elastic stretching members 19 are provided along the expansion and contraction direction and spaced apart from each other; both end portions 19f of the elastically stretchable member 19 are defined as fixed end portions 19f which are fixed to the first sheet by the first hot-melt adhesive 71. At least one of 12S and the second sheet layer 12H; the first sheet layer 12S and the second sheet layer 12H are at least in a range of expansion and contraction directions corresponding to the end portions 19f of the elastically stretchable member 19, by The second hot-melt adhesive 72 is joined; and the holding force of the first hot-melt adhesive 71 is set to be higher than the holding force of the second hot-melt adhesive 72. As such, if the holding force of the first hot-melt adhesive 71 is set higher than the holding force of the second hot-melt adhesive 72, the both end portions 19f of the elastically-expandable member 19 can be more firmly fixed, and the elastically-expandable member 19 The corresponding stretching direction range between the both end portions 19f can join the first sheet layer 12S and the second sheet layer 12H more flexibly. At this time, the portion where the both end portions 19f of the elastically stretchable member 19 are fixed by the first hot-melt adhesive 71 becomes harder in the touch of the skin, but the range is only partial. Further, since the both end portions 19f of the elastically stretchable member 19 are firmly fixed, the second hot-melt adhesive 72 in the range of the expansion and contraction direction corresponding thereto does not have to bear the fixing function of the elastically-expandable member 19 as long as it can be bonded. The one layer 12S and the second sheet layer 12H are sufficient, so that even a hot-melt adhesive having a low holding force does not cause a problem, and on the contrary, there is an advantage that the main stretchable region becomes softer.

(Hot-Fusing Adhesive) As the first hot-melt adhesive 71 and the second hot-melt adhesive 72, for example, EVA type, adhesive rubber type (elastomer type), olefin type, polyester/polyamide The type of hot-melt adhesive is not particularly limited and can be used. In the present invention, the holding force of the first hot-melt adhesive 71 is higher than that of the second hot-melt adhesive 72. In particular, the holding force of the first hot-melt adhesive 71 is preferably more than 120 minutes, and the holding force of the second hot-melt adhesive 72 is preferably from 30 to 90 minutes.

Further, in general, since the heat-fusible adhesive having a high melt viscosity has a high holding force, it is desirable that the first hot-melt adhesive 71 has a higher melt viscosity than the second hot-melt adhesive 72. Specifically, the first hot-melt adhesive 71 preferably has a melt viscosity of 10,000 to 40,000 mPa·s at a temperature of 140 ° C and a melt viscosity of 5,000 to 10,000 mPa·s at 160 ° C, and a second hot-melt adhesive. 72, preferably, the melt viscosity at a temperature of 140 ° C is 3,000 to 7,000 mPa ‧ s and the melt viscosity at 160 ° C is 1000 to 4000 mPa ‧ s.

Further, since the hot-melt adhesive having a high initial adhesive force is suitable for bonding the nonwoven fabrics, it is desirable that the initial initial adhesive force of the second hot-melt adhesive 72 is higher than that of the first hot-melt adhesive 71. Adhesion. Specifically, the initial initial adhesive force of the first hot-melt adhesive 71 is preferably 10 to 500 g/25 mm, and the initial initial adhesive force of the second hot-melt adhesive 72 is preferably 1000 g/25 mm or more.

Further, if the peeling strength of the first hot-melt adhesive 71 is 100 cN/25 mm or more in both the longitudinal direction and the transverse direction, and the peeling strength of the second hot-melt adhesive 72 is 100 cN/25 mm or more in both the longitudinal direction and the transverse direction. It is better.

The first hot melt adhesive 71 and the second hot melt adhesive 72 satisfying the above conditions can be easily purchased from a hot melt adhesive manufacturer.

The basis weight (coating amount) of the first hot-melt adhesive 71 and the second hot-melt adhesive 72 can be appropriately determined, and is preferably in the range of 3 to 30 g/m ² , and particularly preferably set to 10 Within the range of ~20 g/m ² .

(Fixing of the elastically stretchable member) As shown in Fig. 4, Fig. 7, and Fig. 11, the elastically stretchable members 19 in the continuous stretchable region A3 and the intermittent stretchable region A2 are fixed at both end portions 19f in the width direction. The end portion 19f is formed by being fixed to the first sheet layer 12S and the second sheet layer 12H. As shown in the figure, when the elastically stretchable member 19 is provided on both sides in the width direction of the intermediate portion in the width direction of the exterior body 12, both end portions 19f of the elastically stretchable members 19 on both sides in the width direction are provided. When the elastically stretchable member 19 is continuous throughout the width direction of the outer casing 12, the portion of the elastically stretchable member 19 located at both end portions in the width direction of the outer casing 12 is set as the fixed end portion 19f. Fixed end 19f.

The fixed end portion 19f is such that the elastically stretchable member 19 is fixed to the first sheet layer 12S and the second sheet layer 12H by the first hot-melt adhesive 71. As shown in FIGS. 7 , 8 , 11 , and 13 , the first hot-melt adhesive 71 is intermittently disposed at the position overlapping the elastically stretchable member 19, and is intermittently disposed with the elastically stretchable member 19 . In addition to the direction of intersection, as shown in FIGS. 9 , 10 , and 15 , the pattern may be arranged in a pattern extending in the front-rear direction so as to extend over the ends of the plurality of elastically stretchable members 19 . The first hot-melt adhesive 71 may be coated on at least one of the first sheet layer 12S and the second sheet layer 12H by slot coating, curtain coating or the like. When it is applied only to the end of each elastically stretchable member 19, it may be formed by a coating means such as a comb gun or a rubber band nozzle (SureWrap), and only the elastically stretchable member may be formed. The outer peripheral surface of the portion at both ends of 19 is coated.

When the fixed end portion 19f on the center side in the width direction of the intermittent stretchable region A2 is fixed, as shown in FIGS. 7 and 9 , the first hot-melt adhesive 71 is disposed separately from the left and right in the width direction. Alternatively, as shown in Figs. 8 and 10, the first hot-melt adhesive 71 may be continuously disposed over the left and right fixed end portions 19f.

The side seal portion 12A is a portion that is hardened by ultrasonic sealing or heat sealing, and as shown in Fig. 18(a), the fixed end portion 19f on the side seal portion 12A side is located at the side seal portion. In the case of 12A, since the holding force is high, that is, the presence of the hard first hot-melt adhesive 71, there is a fear that the side seal portion 12A becomes too hard. Therefore, as shown in Fig. 18(b), the fixed end portion 19f on the side seal portion 12A side is preferably adjacent to the side seal portion 12A or separated in the width direction center side. Further, from the form shown in Fig. 18(b), it is understood that the bonding portion formed by the first hot-melt adhesive 71 may be the end portion of the expansion and contraction regions A2 and A3 in the expansion and contraction direction, and it is not necessary. As shown in the figure, both ends of the elastically stretchable member 19 may be, for example, not at least one end portion of the elastically stretchable member 19 being an adhesive portion formed by the first hot-melt adhesive 71, but close to the elastically stretchable portion. The bonding portion formed by the first hot-melt adhesive 71 is provided at an appropriate position of the end portion of the member 19 or the like.

12 (d), 12 (f), 12 (g), 14 (d), 14 (g), 16 (d), 16 (f), 16 As shown in FIG. (g), at least a part of each of the bonding sites formed by the first hot-melt adhesive 71 is preferably bonded to the first elastic layer 19 and the first layer without the second hot-melt adhesive 72. At least one of 12S and second sheet 12H. Even when the holding force of the first hot-melt adhesive 71 is higher than that of the second hot-melt adhesive 72, when the layer of only the second hot-melt adhesive 72 is between the bonded objects, when the first hot melt When the layer of the binder 71 and the layer of the second hot-melt adhesive 72 are interposed between the bonding objects (in the case of coating a double layer), although the fixing force of the elastic stretching member 19 becomes high, as long as there is a second heat The layer of the melt-adhesive 72 is interposed therebetween, and the layer is liable to undergo aggregation failure, and the fixing force of the elastically stretchable member 19 is thereby lowered.

Therefore, it is conceivable that the position of the first hot-melt adhesive 71 does not overlap with the position of the second hot-melt adhesive 72 in the passing position of the elastically stretchable member 19 (not shown). However, when the positions of the first hot-melt adhesive 71 and the second hot-melt adhesive 72 are set to be different as such, it becomes necessary to perform the coating intermittently, and the correct position control becomes more difficult. .

Therefore, as shown in FIGS. 7 to 9 and 11 to 16 , the second hot-melt adhesive 72 is preferably in the form of an elastic pattern including at least an intermittent pattern in the expansion and contraction direction. The position of the fixed end portion 19f of the telescopic member 19 (coating the double layer), and at the passing position of the elastically stretchable member 19, the first hot-melt adhesive 71 is made longer than the width of each of the second hot-melt adhesives 72. The mode is continuous in the telescopic direction. Thereby, in the disposition portion of the first hot-melt adhesive 71, although only the two-layer portion in which the first hot-melt adhesive 71 and the second hot-melt adhesive 72 are overlapped is partially formed, in the second hot-melt adhesive Between 72, since the single layer portion of the first hot-melt adhesive 71 is surely formed, the both end portions 19f of the elastically-expandable member 19 can be bonded only by the first hot-melt adhesive 71. In this case, the continuous width 71w of the first hot-melt adhesive 71 may be appropriately determined, preferably more than 5 times the width 72w of the second hot-melt adhesive 72, and preferably adjacent to the second hot-melt adhesive. The interval 72d between the stretching and contracting directions of the agent 72 is 1.5 times or more, and particularly preferably 2 times or more. In general, the total thickness of the portion of the first hot-melt adhesive 71 that does not adhere to the elastically stretchable member 19 by the second hot-melt adhesive 72 is preferably about 5 to 30 mm. Moreover, as a preferable intermittent pattern of the 2nd hot-melt adhesive 72, the continuous joining form of the cross direction mentioned later is mentioned.

(Sheet bonding by the second hot-melt adhesive) The second hot-melt adhesive 72 can be joined to the first sheet 12S as long as it is at least in the width direction range between the fixed end portions 19f of the elastically stretchable member 19. And the second sheet layer 12H, any pattern may be disposed in any range, but as in the illustrated form, it is preferable to provide the same pattern throughout the entire stretchable regions A2, A3, and the stretchable regions A2, A3 comprise elastically stretchable members. Fixed end 19f of 19.

For example, on the outer peripheral surface of the elastically-expandable member 19, the second hot-melt adhesive 72 is applied by a coating means such as a comb type lance or a rubber band nozzle coating, as shown in Fig. 10, which can be elastic only The second hot-melt adhesive 72 is intermittently disposed in a direction orthogonal to the elastically stretchable member 19 at a position where the elastic members 19 are overlapped. Further, although not shown, the hot-melt adhesive 72 may be disposed intermittently in the front-rear direction and the width direction so as not to overlap the elastically stretchable member 19.

Further, in the form shown in FIGS. 7 to 9 and 11 to 16 , the sheet joint portion in which the first sheet layer 12S and the second sheet layer 12H are joined by the second hot-melt adhesive 72 is formed. 70. One of preferred embodiments for forming a perfectly continuous pleats 80 is a continuous joining form in a cross direction arranged in a stripe pattern, the stripe pattern being intermittent in the longitudinal direction of the elastically stretchable member 19. Further, the direction intersecting the elastically stretchable member 19 is continuous. In this form, the elastically stretchable member 19 is fixed to at least one of the first sheet layer 12S and the second sheet layer 12H at least in the fixed end portion 19f by the first hot-melt adhesive 71, and The position intersecting the sheet joint portion 70 is fixed to at least one of the first sheet layer 12S and the second sheet layer 12H by the second hot-melt adhesive 72.

Further, in the continuous joining form in the intersecting direction, as shown in Figs. 11(b), 13(b) and 15(b), respectively, the first sheet 12S and the contraction of the elastically stretchable member 19 are performed. The portions of the second sheet 12H located between the sheet joints 70 are respectively shrunk and bulged in opposite directions to form pleats 80. 11(b), 13(b), and 15(b) are states of natural length, but the elastically stretchable member 19 is elongated to a certain extent in this state when worn, and as shown in Fig. 11 (c) As shown in Fig. 13 (c) and Fig. 15 (c), the bottom of the pleats 80 is widened, and the height 80h of the pleats 80 becomes low in this case. Further, since the stretchable structure is in the form of continuous joining in the intersecting direction, the wrinkles 80 extending straight along the sheet joining portion 70 can be formed, and the gas permeability and the appearance are excellent.

The form shown in Fig. 11 and Fig. 12 is a form in which the direction on the second sheet layer 12H side of the first sheet layer 12S is intermittent in the expansion and contraction direction and the direction intersecting the expansion and contraction direction is specific. The width is continuously applied to the adhesive 72, and on the side of the first sheet 12S side of the second sheet 12H, the adhesive 72 is not applied, but in the first sheet 12S and the second sheet 12H. The elastic elastic member 19 in an extended state is sandwiched between the first sheet layer 12S and the second sheet layer 12H, and the first sheet layer 12S and the elastic stretch member 19, respectively, by the second hot-melt adhesive 72. . At this time, in the portion where the sheet joint portion 70 and the elastic stretchable member 19 intersect, the second hot-melt adhesive 72 is continuous in the direction intersecting the expansion and contraction direction on the first sheet layer 12S side of the elastic stretchable member 19, The elastically stretchable member 19 is fixed to the first sheet layer 12S by the second hot-melt adhesive 72, and on the second sheet 12H side of the elastically stretchable member 19, the second hot-melt adhesive 72 crosses the direction of expansion and contraction. The direction is not continuous. In Fig. 12(e), this discontinuous portion is indicated by the symbol 73. In the second sheet layer 12H, by intermittently presenting the second hot-melt adhesive 72, the softness of the second sheet layer 12H can be suppressed from being lowered, and the first sheet layer 12S and the second sheet layer 12H can be suppressed as a whole. The softness is reduced. Further, in the portion of the elastically stretchable member 19 that intersects the sheet joint portion 70, although it can be considered that the second hot-melt adhesive 72 is continuous only on the side of the first sheet layer 12S, since both sides of the elastically stretchable member 19 are used The sheet joint portion 70 integrates the first sheet layer 12S and the second sheet layer 12H, so that the contraction force of the elastic stretch member 19 acts substantially and identically on the first sheet layer 12S and the second sheet layer 12H, and Uniform pleats are formed on both the first sheet layer 12S and the second sheet layer 12H.

Further, the first sheet layer 12S and the second sheet layer 12H can be coated with the adhesive 72 in the same pattern. At this time, as shown in Figs. 13 and 14, in the portion where the sheet joint portion 70 and the elastically stretchable member 19 intersect, the first sheet layer 12S side and the second sheet layer 12H side of the elastic stretchable member 19 are two. Since the second hot-melt adhesive 72 is continuous in a specific width in the direction intersecting the expansion and contraction direction, there is an advantage that the elastically stretchable member 19 can be more firmly fixed. Further, although not shown, the second heat-fusible adhesive 72 can be applied to the second sheet layer 12H, and the second hot-melt adhesive 72 can be applied to the first sheet layer 12S without elastic coating. The member 19 is sandwiched and fixed. However, in these forms, since the second hot-melt adhesive 72 in the second sheet layer 12H is continuous, not only the flexibility of the second sheet layer 12H which is in contact with the skin but also the softness is lowered. Some of them are further squeezed to the skin due to the elastically stretchable member 19, which is not preferable. Therefore, it is desirable that, as in the form shown in Figs. 11 and 12, the second hot-melt adhesive 72 is discontinuous on the side having the side where the second sheet 12H contacts the skin of the wearer.

In such a form, it is preferable that the width 70w of the sheet joining portion 70 in the expansion and contraction direction is 0.5 to 4 mm (particularly 0.5 to 1 mm), and the interval 70d between the adjacent sheet joining portions 70 is set to 4 to 8 mm. (especially 5 to 7 mm). Basically, if the width 70w of the sheet joining portion 70 in the expansion and contraction direction is too narrow, the application of the second hot-melt adhesive 72 becomes difficult, and if it is too wide, the flexibility is lowered. Further, the width 70w of the stretching direction of each piece joint portion 70 affects the interval between adjacent pleats 80, such as the continuous joining form in the intersecting direction, and when the formed pleats 80 are thin, if the width exceeds 4 mm, the adjacent pleats The interval of 80 may become too wide, and not only the individual pleats 80 may become independent in appearance, but when the wrinkles 80 collapse due to the compressive force in the thickness direction, the wrinkles 80 become widened or collapsed, and the adjacent pleats 80 support each other. As a result, the resistance to deformation or the restoring force after the change is weakened, and as a result, the soft feeling is insufficient.

In addition, when the width 70w of the sheet joining portion 70 in the expansion and contraction direction is simply 0.5 to 4 mm, the case where the interval 70d of the adjacent sheet joining portions 70 is less than 4 mm or more than 8 mm is as follows. In other words, the interval 70d between the adjacent sheet joint portions 70 affects the height 80h and the width of the pleats 80. Therefore, when the interval between the adjacent sheet joint portions 70 is about 2 mm, it is changed to be continuously fixed in the expansion and contraction direction. The pleats 80 lacking continuity in the same longitudinal direction (the sheet joints 70 are intermittently provided in the direction of expansion and contraction also become meaningless); when it is 3 mm, the pleats 80 are straight in the direction orthogonal to the direction of expansion and contraction. It extends, but it is still impossible to expect the adjacent pleats 80 to support each other, so the soft feeling will be insufficient. Further, when the interval 70d of the sheet joint portion 70 exceeds 8 mm, the wrinkles which are generated by the compression at the time of packaging may be irregularly collapsed, so that the appearance of the product is deteriorated. On the other hand, when the width 70w of the sheet joining portion 70 in the expansion and contraction direction is 0.5 to 4 mm and the interval 70d of the sheet joining portion 70 is 4 to 8 mm, a sufficient soft feeling is obtained, and since it is packaged. The wrinkles 80 produced by the compression will become less susceptible to irregular collapse.

Further, in order to improve the flexibility, the width 70w of the sheet joint portion 70 is desirably set to be narrow, for example, 1 mm or less, but the elastically stretchable member 19 by the second hot-melt adhesive 72 is inevitably lowered. The fixing force, therefore, as described above, is very important at the fixed end portion 19f by the first hot-melt adhesive 71 having a higher holding force.

The interval 19d of the adjacent elastically stretchable members 19 can be appropriately determined. If it exceeds 10 mm, although it is different from the longitudinal intermittent joining form, the thickness of the wrinkles 80 changes in the direction intersecting the expansion and contraction direction, and becomes bloated. Therefore, in the present invention, the interval 19d between the adjacent elastically stretchable members 19 is preferably 10 mm or less, and particularly preferably 3 to 7 mm.

The shape of the sheet joint portion 70 (the second hot-melt adhesive 72) can be appropriately determined, and the shape of the sheet joint portion 70 (the second heat-fusible adhesive 72) can be set as shown in Fig. 17, and the shape can be extended in the oblique direction with respect to the elastically stretchable member 19. Preferably, it is a shape that extends in the orthogonal direction with respect to the elastically stretchable member 19.

(Manufacturing Method) At the time of manufacture, the first hot-melt adhesive 71 is applied to at least one of the elastic stretch member 19, or the first sheet layer 12S and the second sheet layer 12H, and the second hot-melt adhesive is applied. 72 is applied to at least one of the first sheet layer 12S and the second sheet layer 12H, and then the two sheets 12S, 12H are aligned, and at the same time, the elastically stretchable member 19 is sandwiched between the two sheets 12S, 12H.

The coating method of the second hot-melt adhesive 72 is not particularly limited, and the width 70w of the sheet joining portion 70 in the expansion and contraction direction is set to be narrow, for example, 1 mm. In the following case, since the application width of the second hot-melt adhesive 72 is narrowed, it is applied by intermittent coating by a coating method such as curtain type or full-surface coating by nozzle spraying. It may become difficult, so it is desirable to apply a pattern coating suitable for narrow coating to transfer the second hot-melt adhesive 72 in a relief pattern. FIG. 19 is a view showing an example of a manufacturing flow in which pattern coating is applied to the application of the second hot-melt adhesive 72. That is, the apparatus of the pattern coating type is fed to a pair of nip rollers 101 in such a manner that the elastically stretchable member 19 is sandwiched between the second sheet layer 12H and the first sheet layer 12S. And forming a telescopic structure shown in FIGS. 11 and 12, wherein a second heat is applied to a surface of the first sheet 12S facing the second sheet 12H side. Fused adhesive 72. The first sheet 12S, before being fed into the nip roll 101, contacts the embossing roll 102 having a convex pattern corresponding to the sheet joint portion 70, that is, a stripe pattern, to transfer the coating In the circumferential direction (the direction in which the transport direction is the MD direction, the direction of the expansion and contraction direction) is intermittently held in the stripe shape in the axial direction (the direction intersecting the transport direction, that is, the CD direction), and is held by the plate roller 102. A second hot melt adhesive 72 on the pattern. Reference numeral 103 denotes a hot-melt adhesive supply roller (an anilox roller in the relief printing) for transferring the second hot-melt adhesive 72 to the convex pattern of the plate roller 102 with a specific thickness; Reference numeral 104 denotes a supply nozzle which supplies the second hot-melt adhesive 72 to the hot-melt adhesive supply roller 103.

In the illustrated embodiment, the first hot-melt adhesive 71 for fixing the fixed end portion 19 of the elastically stretchable member 19 is intermittently overlapped with the elastically stretchable member 19 in a direction orthogonal to the elastically stretchable member 19. Since it is disposed in the manner of the elastically stretchable member 19 on the upstream side of the pressure-bonding position, the nozzle 105 disposed at the conveyance position thereof is intermittently applied to the outer peripheral surface of the elastically-expandable member 19 in the conveying direction. The method may be applied to at least one of the first sheet layer 12S and the second sheet layer 12H intermittently in the conveying direction by a nozzle suitable for pattern coating or spray coating, curtain coating or the like.

(Formation of Non-Expandable Region) The non-elastic region A1 can be designed by applying the first hot-melt adhesive to at least one of the elastic stretch member 19 or the first sheet 12H and the second sheet 12S. The agent 71 then applies the second hot-melt adhesive 72 to at least one of the first sheet 12S and the second sheet 12H, and then aligns the two layers 12S, 12H, and simultaneously clamps the elastically stretchable member 19 Between the sheets 12S and 12H, after the joining of the two sheets 12S and 12H and the fixing of the elastically stretchable member 19 are performed, in the region set as the non-elastic region A1, in the middle of the width direction by heating and pressurization The elastically stretchable member 19 is cut at one or a plurality of places, or substantially the entire elastically stretchable member 19 is cut by pressurization and heating, and the stretchability remains in the intermittent stretchable region A2 and is in the non-stretchable region A1. Suppresses flexibility.

Fig. 20(a) shows a state in which the elastically stretchable member 19 is cut at a position in the middle in the width direction, in which case the cutting object is held by the sealing roller 80 and the anvil roll 90, and then only The elastically stretchable member 19 is heated and pressed to be cut between the cut convex portion 82 and the outer peripheral surface of the anvil roll 90, and the seal roller 80 is provided with a pressurizing portion 81 on the outer peripheral surface. The pressing portion 81 has a cutting convex portion 82 at one position in the circumferential direction, and the cutting convex portion 82 can be heated to a desired temperature; the anvil roller 90 is disposed to face the sealing roller 80 and the surface is smooth; the cutting The broken object is formed by attaching the elastically stretchable member 19 between the first sheet layer 12S and the second sheet layer 12H. As shown in Fig. 21 (a) and (b), the article produced by such processing has only the cut between the first sheet 12S and the second sheet 12H in the non-stretchable region A1. The residual portion is the non-elastic elastic member 19r, and only one molten trace 22 remains as a cut mark, which is continuous from the elastic stretchable member 19 of the intermittent stretchable region A2. Although not illustrated, when the cutting is performed at a plurality of points, it is only necessary to use the sealing roller 80 having the cutting convex portion 82 at a plurality of points in the circumferential direction.

Further, Fig. 20(b) shows a case where the substantially entire elastic elastic member 19 is cut finely, in which case the cutting object is held by the sealing roller 80 and the anvil roller 90, and then only the clamped object is clamped. The elastic stretchable member 19 is heated and pressed to be cut at a portion between the cut convex portion 83 and the outer peripheral surface of the anvil roll 90. The seal roller 80 includes a pressurizing portion 81 on the outer peripheral surface, and the pressurizing portion 81 has a plurality of cut convex portions 83 which are intermittently arranged such as a staggered shape, and the cut convex portion 83 can be heated to a desired temperature; the anvil roll 90 is disposed to face the sealing roller 80 and has a smooth surface The object to be cut is formed by attaching the elastically stretchable member 19 between the first sheet layer 12S and the second sheet layer 12H. As shown in Fig. 21(c), the article processed in this manner intermittently remains in the front-rear direction and the width direction between the first sheet layer 12S and the second sheet layer 12H in the non-stretchable region A1. The residual portion and the cut piece are cut as the unnecessary elastic stretchable member 19r, and the molten trace 22 is intermittently left in the front-rear direction and the width direction as a cut mark; the cut residual portion is continuous from the elastically stretchable member 19 of the intermittent stretchable region A2. The cut piece is a cut piece of the elastically stretchable member that is not continuous with the elastically stretchable member 19 of the intermittent stretchable region A2.

(Sheet joint portion in the non-elastic region). In the non-elastic region A1, the sheet joint portion 70 may not be provided, but since it is not desirable that the first sheet layer 12S is displaced or floated relative to the second sheet layer 12H, it is preferable. The sheet joint portion 70 formed of the second hot-melt adhesive 72 is provided. The sheet joining portion 70 of the non-stretchable region A1 is not particularly limited as long as the two sheets 12S and 12H can be joined, and it is preferable that the sheet joining portion 70 in the non-stretching region A1 is not elastically stretchable in the non-stretching region A1. The member 19r is fixed to the two sheets 12S and 12H by a hot-melt adhesive.

From the viewpoints of ease of manufacture and manufacturing stability, as shown in FIGS. 7 to 10, the shape and size of the sheet joint portion 70 formed of the second hot-melt adhesive 72 in the non-stretchable region A1, The number, arrangement, and the like are desirably set to be the same as the sheet joint portion 70 formed of the second hot-melt adhesive 72 in the intermittent stretch region A2. Of course, the shape, size, number, arrangement, and the like of the sheet joint portion 70 formed by the second hot-melt adhesive 72 in the non-elastic region A1 may be the second heat-fusible adhesive 72 in the intermittent stretch region A2. The formed sheet joints 70 are different.

Others, the details of the sheet joint portion 70 in the non-elastic region A1 are as described in the item of the sheet joint portion 70 in the stretchable region, and thus the description thereof will be omitted.

<Others> In the examples shown in Figs. 7, 9, and 10, although the waistline edge portion W, the waistline lower portion U, and the intermediate portion L portion of the pull-on disposable diaper use the telescopic structure of the present invention, However, as shown in Fig. 8, it is possible to use only the waist lower portion U and the intermediate portion L (in the form of Fig. 8, the waist edge portion W is the first hot-melt bonding in the width direction of the entire elastically stretchable member 19). The agent 71 may be fixed only in the lower portion U of the waist (especially when the intermediate portion L does not have the elastically stretchable member 16). Further, the above-described telescopic structure may be used in other stretchable portions such as a waist portion, a leg portion, or a fixing tape on the back side portion of the three-dimensional wrinkle or adhesive type disposable diaper.

<Description of Terms in the Description> When the following terms are used in the specification, the terms have the following meanings as long as they are not specifically described in the specification. ‧ "The front and rear (longitudinal) direction" refers to the direction connecting the front side (front side) and the back side (rear side), and the "width direction" means the direction orthogonal to the front-rear direction (left-right direction).

‧ The "MD direction" and "CD direction" mean the moving direction (MD direction) in the manufacturing equipment and the horizontal direction (CD direction) orthogonal to the moving direction. When either is set to the front and rear direction, One is the width direction. The MD direction of the non-woven fabric is the direction in which the fibers of the non-woven fabric are arranged. The direction in which the fibers are arranged is along the direction of the non-woven fibers, and can be determined, for example, by the following method: According to the measurement method of the fiber arrangement directivity test method, the fiber alignment test method is the TAPPI standard method T481. The zero-distance tensile strength is measured; or the simple measurement method for determining the fiber arrangement direction from the tensile strength ratio in the front-rear direction and the width direction.

‧ "Expanded state" means a state in which it is flat and unfolded without contraction and relaxation.

‧ "Elongation" is the value when the natural length is set to 100%.

‧ "Basic weight" is measured in the following manner. After the sample or test piece is prepared to be dried, it is placed in a test chamber or apparatus under standard conditions (temperature of test site: 20±5 ° C, relative humidity of 65% or less) to make it constant weight. status. The preliminary drying means that the sample or the test piece becomes a constant weight in an environment having a relative humidity of 10 to 25% and a temperature of not more than 50 °C. Further, the fiber having a legal moisture content of 0.0% may not be subjected to preliminary drying. A sample of a size of 200 mm × 250 mm (± 2 mm) was cut out using a standard plate (200 mm × 250 mm, ± 2 mm) of a test piece in a state of constant weight. The weight of the sample was measured and multiplied by 20 times to calculate the weight per square meter as the basis weight.

‧ "Thickness" is an automatic measurement using an automatic thickness measuring device (KES-G5 portable compression testing machine) under the conditions of a load of 10 gf/cm ² and a pressing area of 2 cm ² .

‧ "Water absorption amount" is measured in accordance with Japanese Industrial Standard JIS K7223-1996 "Test method for water absorption of superabsorbent resin".

‧ "Water absorption rate" is "the time until the end point" when the Japanese Industrial Standard JIS K7224-1996 "Water absorption speed test method for superabsorbent resin" is carried out using 2 g of the superabsorbent polymer and 50 g of physiological saline.

‧ The "peel strength" of the hot melt adhesive is measured by the following operation. That is, two sheets of the hydrophobic spunbonded nonwoven fabric 301 (each of which is 100 mm or more in the MD direction and 75 mm or more in the CD direction) are prepared, and in the central portion of the CD direction of one of the nonwoven fabrics 301, a coating width of 25 mm is applied in the MD direction. The coating amount of 20 g/m ² is continuously applied to the object to be measured, that is, the hot-melt adhesive 302, and then the other non-woven fabric 301 is aligned with the MD direction and the CD direction by the hot-melt adhesive 302, and then bonded thereto. The 2 kg roller was pressure-bonded one by one to prepare a nonwoven fabric bonded body 300 shown in Fig. 22; the nonwoven fabric 301 was composed of PP fibers having a fineness of 1.44 dtex and a basis weight of 17 g/m ² . Then, the non-woven fabric 300 was cut by the cutting line shown by the broken line in Fig. 22, and the following test piece was produced: the longitudinal direction test piece 310, which was 75 mm in the MD direction and 25 mm in the CD direction, and the entire surface was And a lateral direction test piece 320 having a non-adhesive portion 321 having an MD direction of 25 mm × a CD direction of 75 mm and a distance of 25 mm from both ends in the CD direction, and a bonding between the non-adhesive portions 321 and an MD direction of 25 mm × CD direction of 25 mm. Section 322. Further, in the longitudinal direction test piece 310, as shown by the two-dot chain line of Fig. 22, peeling is performed (by peeling the target portion by cold spray to reduce the adhesion of the target portion and peeling) from the MD direction. Two non-woven fabrics of the end of 25 mm are counted at one end to form a gripping portion 311, and then the gripping portions 311 of the respective non-woven fabrics are respectively gripped by the upper and lower jigs of the tensile testing machine, and are separated by a jig at a distance of 30 mm and a tensile speed of 300 mm/min. Conditions, the residual adhesive portion 312 was peeled off as shown in Fig. 23 to measure the tensile force (cN/25 mm) required for the stripping. The lateral test piece 320 was subjected to the same operation as the longitudinal test piece 310 except that the non-bonding portions of the non-adhesive portions 321 at one end in the CD direction were respectively taken up by the upper and lower jigs of the tensile tester. Observing the state of failure of the peeled portion, and then selecting the wavy portion after the start of peeling (after the curve is no longer raised) in the measurement curve in which the vertical axis is the tensile force when the interface is broken (interfacial peeling) and agglutination is broken. The first five vertices and the first five bottom points are used to set the average value of the tensile force at each point to the measured value. Further, when the material is broken (substrate destruction), the maximum value of the tensile force is taken as the measured value. Each of the longitudinal test piece 310 and the lateral test piece 320 was measured three times or more, and the measured values of three times were averaged to obtain a longitudinal peel strength and a horizontal peel strength.

‧ The "retention" of the hot-melt adhesive can be measured by the following operations. That is, as shown in Fig. 24, a test piece 400 was prepared by preparing a PET film having a thickness of 25 μm and lengthwise end portions of two rectangular PET films 401 having a length of 100 mm × a width of 25 mm (from the longitudinal direction) The one end of the 25 mm portion is bonded to each other by the measurement object, that is, the hot-melt adhesive layer 402. The adhesive portion 403 of the test piece 400 was 25 mm × 25 mm. The hot-melt adhesive layer 402 is coated by a slit coating at a thickness of 20 g/m ² , and bonded to the adhesive portion 403 to press the 2 kg roller back and forth once, and then the test piece 400 is placed. The film was placed at normal temperature (23 ° C) for 16 hours. Further, as shown in Fig. 25, in the thickness direction, the PET film 401 at both ends of the test piece 400 was gripped by a screw-tight jig 404, and then applied to the adhesive portion 403. The force was placed in a creep tester (thermostat) at 40 ° C for 2 hours. Thereafter, in the creep tester, as shown in Fig. 25, one of the jigs 404 is suspended downward from above, and the hammer 405 is suspended on the other jig 404, and the jig 405 and the jig-side jig 404 are applied. In total, a vertical load of 1 kg was measured, and then the time from the start of the application of the load to the time when the adhesive portion 403 was completely peeled off and the PET film on the side of the hammer 405 was peeled off and dropped was measured. When the measurement was performed within 120 minutes and the hammer did not fall after 120 minutes, the measurement result was "over 120 minutes". The measurement was performed three times or more, and the average value of the measurement results was set as the retention force (minutes). In the measurement results of three times, when it is once more than 120 minutes, and two times of 120 minutes or less, the average value of the measurement results of two times of 120 minutes or less is taken as the holding force; when it is more than 120 minutes, it is twice. In the case of one time of 120 minutes or less, the measurement result of one time of 120 minutes or less is set as the holding force, and when it is more than 120 minutes for three times, the holding force is set to exceed 120 minutes.

"Armular initial adhesion" means a value measured as follows. That is, the hot melt adhesive was applied to a PET plate having a thickness of 50 μm at a thickness of 50 μm. Further, the PET sheet coated with the hot-melt adhesive was cut into a width of 25 mm and a length of 125 mm, and formed into a strip shape, and then looped so that both ends of the strip were overlapped. This ring was fixed to an LT-100 type initial adhesive tester (manufactured by Chem Instruments, Inc.), and bonded to a PE (polyethylene) plate with a bonding area of 25 mm × 25 mm and a bonding time of 2 seconds. Then, the endless belt was peeled off at a peeling speed of 300 mm/min at 20 ° C, and then the maximum force was measured, and the initial adhesive force of the ring was set.

‧ "Fused Viscosity" is measured at a set temperature using a Brookfield B-type viscometer (Spindle No. 027 (model)) in accordance with JIS Z 8803.

‧ When the environmental conditions during the test or measurement are not described, the test or measurement is performed in a test room or apparatus under standard conditions (test site temperature 20 ± 5 ° C, relative humidity 65% or less).

‧The dimensions of each part are the dimensions in the unfolded state, not the natural length, unless otherwise specified. (industrial availability)

The present invention is suitable for use in a pant type disposable diaper as described above, and can of course be applied to a pasting type diaper of a pasting type or a pad type, and can be applied to a telescopic structure of all absorbent articles such as sanitary napkins and the manufacture thereof. In the method.

11‧‧‧ liquid-impermeable tablets
12‧‧‧Outer body
12A‧‧‧Side seal
12H‧‧‧Second layer
12S‧‧‧ first layer
12r‧‧‧return part
15‧‧‧Flexible elastic members
16‧‧‧Flexible elastic members
17‧‧‧Flexible elastic members
19‧‧‧Flexible elastic members
19f‧‧‧Fixed end
19r‧‧‧Do not elastically stretchable members
22‧‧‧ melting traces
30‧‧‧Top film
40‧‧‧Intermediate film
50‧‧‧absorbing elements
56‧‧‧Acceptor
56X‧‧‧Width of the absorber
58‧‧‧Package
60‧‧‧Three-dimensional wrinkles
62‧‧‧ pleated sheets
63‧‧‧Flexible elastic members
64‧‧‧Waterproof film
65‧‧‧Installation section
66‧‧‧ highlight
67‧‧‧Hot-melt adhesive
70‧‧ ‧ piece joint
70d‧‧‧ spacing of adjacent sheet joints 70
Width of the telescopic direction of the 70w‧‧ piece joint 70
71‧‧‧First hot melt adhesive
71w‧‧‧Continuous width of the first hot melt adhesive 71
72‧‧‧Second hot melt adhesive
72d‧‧‧Interval of the expansion and contraction direction of the second hot-melt adhesive 72
72w‧‧‧Width of the second hot melt adhesive 72
80‧‧ ‧ pleats
80‧‧‧sealing roller
Height of 80h‧‧ pleats 80
81‧‧‧ Pressurization
82‧‧‧cutting the convex part
83‧‧‧cutting the convex part
90‧‧‧ Anvil Roll
101‧‧‧Clamping roller
102‧‧‧ version of the roller
103‧‧‧Hot-melt adhesive supply roller
104‧‧‧Supply nozzle
200‧‧‧ internal body
201‧‧‧The joint area of the inner body 200 and the outer body
300‧‧‧non-woven adhesive
301‧‧‧Hydraulic spinning bonded non-woven fabric
302‧‧‧Hot-melt adhesive
310‧‧‧Vertical test piece
311‧‧‧Catch
320‧‧‧Horizontal test piece
321‧‧‧non-adhesive part
322‧‧‧bonding part
400‧‧‧ test piece
401‧‧‧PET film
402‧‧‧Hot-melt adhesive layer
403‧‧‧bonding part
404‧‧‧Clamp
405‧‧‧ hammer
A1‧‧‧ non-stretchable area
A2‧‧‧Intermittent expansion zone
A3‧‧‧Continuous stretch area
B‧‧‧Back body
F‧‧‧Predecessor
L‧‧‧Intermediate
LO‧‧‧ leg openings
T‧‧‧ Waist circumference
U‧‧‧ lower waistline
W‧‧‧ Waist edge
WO‧‧‧waist opening
Full width of X‧‧‧ diapers
Y‧‧‧ full length of diaper

Fig. 1 is a plan view showing the unfolded state of the inner surface of the pull-on disposable diaper. Fig. 2 is a plan view showing the unfolded state of the outer surface of the pull-on disposable diaper. Fig. 3 is a cross-sectional view taken along line 3-3 of Fig. 1. Fig. 4 is a cross-sectional view taken along line 4-4 of Fig. 1. Fig. 5(a) is a cross-sectional view taken along line 5-5 of Fig. 1; Fig. 5(b) is a cross-sectional view taken along line 2-2 of Fig. 1. Figure 6 is a perspective view of a pant-type disposable diaper. Fig. 7 is a plan view showing the outer casing in an unfolded state. Fig. 8 is a plan view showing the exterior body in an unfolded state. Fig. 9 is a plan view showing the outer casing in an unfolded state. Fig. 10 is a plan view showing the exterior body in an unfolded state. Fig. 11(a) is a plan view of the telescopic structure in an unfolded state; Fig. 11(b) is a cross-sectional view taken along line 6-6 of the natural length state; and Fig. 11(c) is an edge extending to a certain degree. Sectional view of line 6-6. Fig. 12(d) is a sectional view taken along line 8-8 of Fig. 11; Fig. 12(e) is a sectional view taken along line 7-7 of Fig. 11; Fig. 12(f) is along the line Fig. 11 is a sectional view taken on line 9-9; Fig. 12(g) is a sectional view taken along line 10-10 in Fig. 11. Fig. 13(a) is a plan view of the telescopic structure in an unfolded state; Fig. 13(b) is a cross-sectional view taken along line 6-6 of the natural length state; and Fig. 13(c) is an edge extending to a certain degree. Sectional view of line 6-6. Fig. 14(d) is a sectional view taken along line 8-8 of Fig. 13; Fig. 14(e) is a sectional view taken along line 7-7 of Fig. 13; Fig. 14(f) is along the line Fig. 13 is a sectional view taken along line 9-9; Fig. 14(g) is a sectional view taken along line 10-10 of Fig. 13. Fig. 15(a) is a plan view of the telescopic structure in an unfolded state; Fig. 15(b) is a cross-sectional view taken along line 6-6 of the natural length state; and Fig. 15(c) is a state of elongation to a certain degree. Sectional view of line 6-6. Fig. 16(d) is a sectional view taken along line 8-8 of Fig. 15; Fig. 16(e) is a sectional view taken along line 7-7 of Fig. 15; Fig. 16(f) is along the line Fig. 15 is a sectional view taken along line 9-9; Fig. 16(g) is a sectional view taken along line 10-10 in Fig. 15. Figure 17 is a plan view of the telescopic structure in an unfolded state. Fig. 18 is a plan view showing an important part of the exterior body in an unfolded state. Figure 19 is a manufacturing flow chart of the telescopic structure. Figure 20 is a perspective view of the cutting device. Fig. 21 is an enlarged plan view showing an important part of various cut patterns in the non-stretchable region. Fig. 22 is an explanatory view of a test piece of the peel strength measurement test. Fig. 23 is an explanatory diagram of a peel strength measurement test. Fig. 24 is an explanatory view of a test piece of the holding force measurement test. Fig. 25 is an explanatory diagram of the holding force measurement test.

Domestic deposit information (please note according to the order of the depository, date, number)

Foreign deposit information (please note in the order of country, organization, date, number)

(Please change the page separately) No

12S‧‧‧ first layer

12H‧‧‧Second layer

19‧‧‧Flexible elastic members

19d‧‧‧Interval of elastically stretchable members 19

19f‧‧‧ Both ends of the elastically stretchable member 19

70‧‧ ‧ piece joint

70d‧‧‧ spacing of adjacent sheet joints 70

Width of the telescopic direction of the 70w‧‧‧ joint

71‧‧‧First hot melt adhesive

71w‧‧‧Continuous width of the first hot melt adhesive 71

72‧‧‧Second hot melt adhesive

72d‧‧‧Interval of the expansion and contraction direction of the adjacent second hot-melt adhesive 72

72w‧‧‧Continuous width of the second hot melt adhesive 72

80‧‧ ‧ pleats

Height of 80h‧‧ pleats 80

Claims (12)

An elastic structure of an absorbent article, comprising: a first sheet layer composed of a non-woven fabric; and a second sheet layer facing opposite one side of the first sheet layer and composed of a non-woven fabric; a plurality of elongate elastically-expandable members disposed between the first sheet and the second sheet in a direction of expansion and contraction and spaced apart from each other; wherein a pair of adhesive portions spaced apart in the stretching direction The elastically stretchable member is fixed to at least one of the first sheet layer and the second sheet layer by a first hot-melt adhesive; at least in a range of expansion and contraction directions corresponding to the pair of bonding portions The first sheet layer and the second sheet layer are joined together by a second hot-melt adhesive; the holding force of the first hot-melt adhesive is higher than the holding force of the second hot-melt adhesive. The stretchable structure of the absorbent article according to claim 1, wherein the first hot-melt adhesive has a melt viscosity higher than a melt viscosity of the second hot-melt adhesive. The expansion/contraction structure of the absorbent article according to claim 1 or 2, wherein the second hot-melt adhesive has an initial initial adhesive force higher than that of the first hot-melt adhesive. The stretchable structure of the absorbent article according to claim 1 or 2, wherein the first hot-melt adhesive has a peel strength of 100 cN/25 mm or more in both the longitudinal direction and the transverse direction, and the second hot-melt adhesive The peel strength is 100 cN/25 mm or more in both the longitudinal direction and the transverse direction. The stretchable structure of the absorbent article according to claim 1 or 2, wherein the sheet joint portion obtained by joining the first sheet layer and the second sheet layer by the second hot-melt adhesive is stripe-shaped The stripe pattern is intermittent in the longitudinal direction of the elastically stretchable member and continuous in a direction intersecting the elastically stretchable member; and the width of each of the sheet joint portions in the expansion and contraction direction is 0.5 to 4 mm. The interval between adjacent sheet joints is 4 to 8 mm. The expansion/contraction structure of the absorbent article according to claim 5, wherein the first hot-melt adhesive is disposed at a position intermittent with respect to the elastically stretchable member and overlapping the elastically stretchable member. The stretchable structure of the absorbent article according to claim 1 or 2, wherein the absorbent article is a pant-type disposable diaper, and the pull-on disposable diaper has an outer body and an inner body, and the outer body constitutes a front body And the back body, the inner body includes an absorber and the inner body is mounted on the outer body; and both sides of the outer body in the front body and the outer sides of the outer body in the back body are respectively Engaging, the front-back direction range corresponding to the joined portion is an annular waist portion, and a waist opening portion and a pair of left and right leg openings are formed; the telescopic structure includes at least the outer casing In the region on both sides in the width direction of the package, the elastically stretchable member is disposed in the width direction. A method for manufacturing a stretchable structure of an absorbent article, characterized in that a plurality of elongated elastic stretchable members are sandwiched between a first sheet composed of a nonwoven fabric and a side opposite to the first sheet layer Between the second sheets of the nonwoven fabric, the elastically stretchable members are disposed at intervals along the expansion and contraction direction; and the elastically stretchable members are formed by a pair of adhesive portions spaced apart from each other in the expansion and contraction direction The first hot-melt adhesive is fixed to at least one of the first sheet layer and the second sheet layer, and at least in a range corresponding to a stretching direction between the pair of bonding portions, the first sheet layer and The second sheet is joined by a second hot-melt adhesive having a lower holding force than the first hot-melt adhesive. The method for producing a stretchable structure of an absorbent article according to claim 8, wherein the first hot-melt adhesive has a melt viscosity higher than a melt viscosity of the second hot-melt adhesive. The method for producing a stretchable structure of an absorbent article according to claim 8 or 9, wherein the second initial adhesive bond of the second hot-melt adhesive is higher than the initial initial adhesive force of the first hot-melt adhesive. The method for producing a stretchable structure of an absorbent article according to claim 8 or 9, comprising the step of: a second hot-melt adhesive coating step of causing the circumferential direction of the plate roll to be a telescopic direction, At least one of the first sheet layer and the second sheet layer is in contact with the plate roll, and the aforementioned hot melt is held on the outer peripheral surface of the plate roll in a stripe pattern intermittently and continuously in the axial direction in the circumferential direction. Adhesive, transferred to at least one of the first sheet and the second sheet; and a crimping step of clamping the elastically stretchable member between the first sheet and the second sheet, The second hot-melt adhesive is transferred onto at least one of the first sheet and the second sheet; and, in the second hot-melt adhesive coating step, the outer peripheral surface of the plate roll is The width of each of the second hot-melt adhesives in the circumferential direction is set to 0.5 to 4 mm, and the interval between the adjacent second hot-melt adhesives in the circumferential direction is set to 4 to 8 mm. The method for producing a stretchable structure of an absorbent article according to claim 11, wherein the first heat-fusible adhesive coating step is applied to the elastic stretchable member; and In the crimping step, the elastic stretch member coated with the first hot-melt adhesive is sandwiched between the first sheet and the second layer on which at least one of the second hot-melt adhesive has been transferred. Between slices.